QuestionsHow to growVegetable GrowingTypesbolting 0 Vote Up Vote Down fons jaspers asked 14 years ago What causes a plant (chard, lettuce) to bolt? Or: how to prevent that? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago Chard, lettuce and all vegetables eventually produce flower stems and go to seed. This is natural but if they do so prematurey it is called bolting. This is caused by uneven growing conditions, drought, cold weather, hot weather and disruption of the roots by transplanting.